Everyone knows the commercials about “low T” and how men can retain their “vigor” but this also referring to basically a powerful PED. I am 76 and so far my testosterone is normal and I can’t be sure how I’d react if it wasn’t but a friend pointed out a world record holding swimmer who was faster in his 70s than 60s and faster at 75 than 70. My friend said this is very unlikely to be from better training. As I was close to WR times at 75 this is not an academic discussion for me . So what is fair .